<template>
	<view>
    <!-- 使用自定义搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
    <!-- <my-search :bgcolor="'pink'" :radius="10" ></my-search> -->
		<view class="scroll-view-container">
		  <!-- 左侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" class="left-scroll-view">
        <block v-for="(item,index) in cateList" :key="index">
        <view :class="['left-scroll-view-item', index=== active ? 'active' : '']" @click="activeChangeFn(index)">
            {{item.cat_name}}
        </view>
        </block>
      </scroll-view>
     <!-- 右侧的滚动视图区域 -->
     <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
       <!-- 二级分类 -->
       <view class="cate-lv2" v-for="(item2, index2) in cateLevelTwo" :key="index2">
         <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
         <!-- 动态渲染三级分类的列表数据 -->
         <view class="cate-lv3-list">
           <!-- 三级分类 Item 项 -->
           <view class="cate-lv3-item" v-for="(item3, index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
             <!-- 图片 -->
             <image :src="item3.cat_icon"></image>
             <!-- 文本 -->
             <text>{{item3.cat_name}}</text>
           </view>
         </view>
       </view>
     </scroll-view>
		</view>
	</view>
</template>

<script>
import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
		data() {
			return {
        //当前设备可用高度
				wh:0, 
        //分类列表数据
        cateList:[],
        //激活项
        active:0,
        //二级分类数组
        cateLevelTwo:[],
        //滚动位置
        scrollTop:0
			};
		},
    onLoad() {
      //拿到屏幕高度
     const syeInfo= uni.getSystemInfoSync()
     this.wh=syeInfo.windowHeight-50
     //调用方法获取分类列表数据
     this.getCateList()
    },
    methods:{
      //获取分类列表数据
      async  getCateList(){
        const {data:res}= await uni.$http.get('/api/public/v1/categories')
        console.log(res)
        if(res.meta.status!==200) return uni.$showMsg()
        this.cateList=res.message
        //为二级分类赋值
        this.cateLevelTwo=res.message[0].children
      },
      //点击切换左侧激活项
      activeChangeFn(index){
        this.active=index
        //重新为二级分类赋值
      this.cateLevelTwo=this.cateList[index].children
      //让scrollTop的值在0与1之间切换
      this.scrollTop=this.scrollTop=== 0 ? 1 : 0
      },
      //跳转到商品列表页
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      //点击自定义组件跳转到搜索页
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
	}
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{ 
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active{
        position: relative;
        background-color: #FFFFFF;
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
    }
  }
}
</style>
